http://nopr.niscair.res.in/handle/123456789/5188 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/5509 Title: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> Study of spatial variability and enrichment of selected toxic elements in ambient particulate matter around a phosphatic fertilizer plant in central India </smarttagtype></smarttagtype> <br/> <br/>Authors: Sharma, Rajnikant; Pervez, Shamsh <br/> <br/>Abstract: Up and downwind sampling methodology is adopted to assess the contribution of some selected toxic elements in ambient air around a phosphatic fertilizer plant located in southeastern part of Chhattisgarh State of India. Ambient air sampling for Respirable Suspended Particulate Matter (RSPM) and Non-Respirable Suspended Particulate Matter (NRSPM) were carried out from September 2000 to June 2001 and fifteen selected elements (Fe, Ca, Mg, Na, K, Al, Zn, Mn, Cu, Cr, Co, Cd, Pb, As, Hg and Ni) were analyzed by standard methods of chemical analysis. Out of these elements F, Cr, Pb, Ni, Cu, Cd and As have shown higher enrichment values. Almost all the elements have shown higher spatial variability in RSPM than NRSPM fraction of the dust. <br/> <br/>Page(s): 949-956 http://nopr.niscair.res.in/handle/123456789/5508 Title: Application of carbon aerogel for electrolytic removal of mercury from aqueous solutions <br/> <br/>Authors: Madaria, Parul Rana; Mohan, N; Rajagopal, C; Garg, B S <br/> <br/>Abstract: A study has been carried out to determine the feasibility of electrochemical removal of mercury ions from aqueous solution using carbon aerogel electrodes. In this work the influence of three parameters viz., initial concentration (2-8 mg/L), pH (2-9), and charge (0.3-1.3 Ah) on the percentage removal of mercury are examined using response surface methodological approach. The metal ion removal significantly increases at slightly acidic and high charge conditions. This technique can achieve more than 96 per cent of mercury removal under optimised conditions of high charge (1.3 Ah) and pH 5.5. However, under highly acidic conditions, electrostatic repulsions caused by H⁺ions lead to lower mercuric ion removal. The experiments are statistically designed using box-behnken experimental design model. This model is also used to derive a second order polynomial equation, which can be used to optimise the key parameters for maximising the removal percentage. <i style="">R</i> ² value of 0.9762 is obtained from the regression analysis. This shows a close fit between the experimental results and model predictions. <br/> <br/>Page(s): 938-943 http://nopr.niscair.res.in/handle/123456789/5507 Title: Structural analysis of coal ash based mine prop <br/> <br/>Authors: Deb, Debasis; Chugh, Yoginder Paul <br/> <br/>Abstract: This paper emphasizes structural analysis of post using finite element analysis and theoretical models. For small size post, an axially symmetric model is utilized to analyze stress distribution in the post and sheath, where applicable. Analyses are directed towards obtaining the distribution of confining pressure on coal ash based grout due to sheathing material. Buckling of big size post is also studied. An extensive laboratory testing is conducted to obtain engineering properties of coal ash based post and crib members. Full scale buckling testing of coal ash based post is also carried out to compare results obtain from testing of timber support. <br/> <br/>Page(s): 931-937 http://nopr.niscair.res.in/handle/123456789/5502 Title: Removal of colour and detoxification of pulp and paper mill effluent by microorganisms in two step bioreactor <br/> <br/>Authors: Singh, Pratibha; Thakur, Indu Shekhar <br/> <br/>Abstract: Eight fungal isolates and a bacterial community comprising four strains were isolated from pulp and paper mill effluent. Decolourization and phenol reduction of pulp and paper mill effluent was determined by fungi and bacterial isolates. Among the fungi, <i style="">Paecilomyces </i>sp<i style="">.,</i> exhibited significant reduction in phenol (40 per cent), lignin (66 per cent), COD (75 per cent) and colour (81 per cent) in 100 L sequential bioreactor supplemented with 1 per cent carbon and 0.2 per cent nitrogen source at 6 h retention time. However the treated effluent of fungus subsequently treated by bacterial strain, <i style="">Microbrevis luteum,</i> showed reduction in phenol (77 per cent), colour (84 per cent), COD (83 per cent) and lignin (72 per cent) on day one. Metabolites extracted from pulp and paper mill effluent were analyzed by HPLC which indicated the presence of at least three major contaminants, in which one of them, at RT 6.5, was utilized by fungus and bacteria. <br/> <br/>Page(s): 944-948